Keywords : bathymetry

Bathymetry

Importation/exportation

The aim of data importation in CARAIBES is to put all types of multibeam data (Simrad EM120, EM3000, EM710, EM1000, EM12, EM300, …, Reson 7150, 7125, 7111, ...SeaBeam, Atlas/Hydrosweep, Thomson/Sea Falcon 11, …) into a common format. This allows joint processing and merging in the framework of data compilation. CARAIBES provides exportation facilities at each processing step (raw data, georeferenced data, DTM) to formats usable in other systems : Ascii, DXF, ArcView, MicroStation, GMT.

Data filtering

After importation, the data can be filtered with various methods :

  • correction of tidal effects, calculation with new sound velocity profile, correction of attitude bias,
  • graphic ping editor,
  • automatic raw soundings invalidation by comparison with a reference Digital Terrain Model.

Data gridding

After the filtering step, bathymetric data are merged with navigation data, then interpolated to the nodes of a regular grid to obtain a Digital Terrain Model (DTM).

Several operations allow corrections to the DTM :

  • smoothing by bicubic spline or numeric filter,
  • interpolation, reset, etc.
  • combination of several DTM.

Visualization and printing

Data can be visualized for every processing step, under various aspects :

  • coverage along the navigation, allowing the display of seafloor swathed by the sounder,
  • isobaths from raw data along the navigation or from DTM,
  • bathymetric section along any path.

Available printing formats are : PostScriptâ, HPGL2.